分享一个项目中在用的图片处理工具类(图片缩放，旋转，画布格式，字节,image,bitmap转换等)
2024-09-04 19:36:28
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Threading; namespace ConfigLab.Comp.Img.ImgUtils
{
/// <summary>
/// 功能简介：图片转换类
/// 创建时间：2016-9-10
/// 创建人：pcw
/// 博客：http://www.cnblogs.com/taohuadaozhu
/// </summary>
public class ImgConvert
{
/// <summary>
/// 字节数组转换为bitmap
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static Bitmap BytesToBitmap(byte[] buffer)
{
Bitmap bitmapResult = null;
if (buffer != null && buffer.Length > 0)
{
using (MemoryStream ms = new MemoryStream(buffer))
{
try
{
bitmapResult = new Bitmap(ms);
return bitmapResult;
}
catch (Exception error)
{
return bitmapResult;
}
finally
{
ms.Close();
ms.Dispose();
}
}
}
return null;
}
/// <summary>
/// 字节数组转换为Image对象
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static Image BytesToImage(byte[] buffer)
{
if (buffer != null && buffer.Length > 0)
{
using (MemoryStream ms = new MemoryStream(buffer))
{
Image image = null;
try
{
image = Image.FromStream(ms);
return image;
}
catch (Exception error)
{
return image;
}
finally
{
ms.Close();
ms.Dispose();
}
}
}
return null; } /// <summary>
/// 按照一定的比率进行放大或缩小
/// </summary>
/// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>
/// <param name="rotateFlipType">
///顺时针旋转90度 RotateFlipType.Rotate90FlipNone
///逆时针旋转90度 RotateFlipType.Rotate270FlipNone
///水平翻转 RotateFlipType.Rotate180FlipY
///垂直翻转 RotateFlipType.Rotate180FlipX
///保持原样 RotateFlipType.RotateNoneFlipNone
/// </param>
/// <param name="IsTransparent">背景是否透明</param>
/// <returns>Bitmap对象</returns>
public static Bitmap GetImage_Graphics(Image ResourceImage, double Percent, RotateFlipType rotateFlipType, bool IsTransparent)
{
Bitmap ResultBmp = null;
try
{
if (ResourceImage != null)
{
ResourceImage.RotateFlip(rotateFlipType);
int _newWidth = (int)Math.Round(ResourceImage.Width * Percent);
int _newHeight = (int)Math.Round(ResourceImage.Height * Percent);
ResultBmp = new System.Drawing.Bitmap(_newWidth, _newHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);//创建图片对象
Graphics g = null;
try
{
g = Graphics.FromImage(ResultBmp);//创建画板并加载空白图像
if (g != null)
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor; //System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;//设置保真模式为高度保真
g.DrawImage(ResourceImage, new Rectangle(0, 0, _newWidth, _newHeight), 0, 0, ResourceImage.Width, ResourceImage.Height, GraphicsUnit.Pixel);//开始画图
if (IsTransparent)
{
ResultBmp.MakeTransparent(System.Drawing.Color.Transparent);
}
}
}
catch (Exception errr)
{
ConfigLab.Utils.SaveErrorLog(string.Format("GetImage_Graphics(1)，异常={0}", errr.Message));
Thread.Sleep(100);
}
finally
{
if (g != null)
{
g.Dispose();
}
}
}
}
catch (Exception ex)
{
ConfigLab.Utils.SaveErrorLog(string.Format("GetImage_Graphics(2)，异常={0}", ex.Message));
Thread.Sleep(100);
return null;
}
finally
{
if (ResourceImage != null)
{
ResourceImage.Dispose();
}
}
return ResultBmp;
}
/// <summary>
/// 图片等比缩放
/// </summary>
/// <param name="sImgFilePath"></param>
/// <param name="Percent"></param>
/// <returns></returns>
public static bool ChangeImgSize(string sImgFilePath, double Percent,string sNewImgFilePath)
{
Image img = null;
Bitmap bp = null;
bool bSuccess = false;
try
{
if (File.Exists(sImgFilePath) == false)
{
Utils.SaveErrorLog(string.Format("找不到待压缩的原文件{0}", sImgFilePath));
return false;
}
img = Image.FromFile(sImgFilePath);
if (img != null)
{
bp = GetImage_Graphics(img, Percent, RotateFlipType.RotateNoneFlipNone, true);
if (bp != null)
{
string sDirectory = FilePathUtils.getDirectory(sNewImgFilePath);
if (sDirectory.EndsWith("\\") == false)
{
sDirectory = string.Format("{0}\\", sDirectory);
}
bp.Save(sNewImgFilePath);
bSuccess=true;
}
}
}
catch(Exception ex)
{
Utils.SaveErrorLog(string.Format("ChangeImgSize处理{0}的图片且保存到{1}的任务执行失败",sImgFilePath,sNewImgFilePath), ex);
}
finally
{
if (img != null)
{
img.Dispose();
}
if (bp != null)
{
bp.Dispose();
}
}
return bSuccess;
}
/// <summary>
/// Resize图片
/// </summary>
/// <param name="bmp">原始Bitmap</param>
/// <param name="newW">新的宽度</param>
/// <param name="newH">新的高度</param>
/// <returns>处理以后的Bitmap</returns>
public static Bitmap ResizeBmp(Bitmap bmp, int newW, int newH)
{
try
{
Bitmap b = new Bitmap(newW, newH);
Graphics g = Graphics.FromImage(b);
g.SmoothingMode = SmoothingMode.HighSpeed;
g.CompositingQuality = CompositingQuality.HighSpeed;
g.InterpolationMode = InterpolationMode.Low;
g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
g.Dispose(); return b;
}
catch
{
return null;
}
} /// 将图片Image转换成Byte[]
/// </summary>
/// <param name="Image">image对象</param>
/// <param name="imageFormat">后缀名</param>
/// <returns></returns>
public static byte[] ImageToBytes(Image Image, System.Drawing.Imaging.ImageFormat imageFormat)
{
if (Image == null) { return null; }
byte[] data = null;
using (MemoryStream ms = new MemoryStream())
{
using (Bitmap Bitmap = new Bitmap(Image))
{
Bitmap.Save(ms, imageFormat);
ms.Position = 0;
data = new byte[ms.Length];
ms.Read(data, 0, Convert.ToInt32(ms.Length));
ms.Flush();
}
}
return data;
} /// <summary>
/// 通过FileStream 来打开文件，这样就可以实现不锁定Image文件，到时可以让多用户同时访问Image文件
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public static Bitmap ReadImageFile(string path)
{
if (string.IsNullOrEmpty(path))
return null;
if (File.Exists(path) == false)
return null;
int filelength = 0;
Bitmap bit = null;
Byte[] image = null;
try
{
using (FileStream fs = File.OpenRead(path))//OpenRead
{
filelength = (int)fs.Length; //获得文件长度
image = new Byte[filelength]; //建立一个字节数组
fs.Read(image, 0, filelength); //按字节流读取
System.Drawing.Image result = System.Drawing.Image.FromStream(fs);
bit = new Bitmap(result);
if (fs != null)
{
fs.Close();
fs.Dispose();
}
}
}
catch (Exception err)
{
ConfigLab.Utils.SaveErrorLog(string.Format("读取图片【{0}】失败,调试信息={1}", path, err.Message + err.StackTrace));
}
finally
{
if (image != null)
{
image = null;
}
}
return bit;
}
}
}
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